IB/hfi1: Use fallthrough pseudo-keyword

Replace the existing /* fall through */ comments and its variants with the
new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/v5.7-rc7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Link: https://lore.kernel.org/r/20200721133455.GA14363@embeddedorSigned-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/hfi1/firmware.c

@@ -1868,11 +1868,8 @@ int parse_platform_config(struct hfi1_devdata *dd)
 									2;
 				break;
 			case PLATFORM_CONFIG_RX_PRESET_TABLE:
-				/* fall through */
 			case PLATFORM_CONFIG_TX_PRESET_TABLE:
-				/* fall through */
 			case PLATFORM_CONFIG_QSFP_ATTEN_TABLE:
-				/* fall through */
 			case PLATFORM_CONFIG_VARIABLE_SETTINGS_TABLE:
 				pcfgcache->config_tables[table_type].num_table =
 							table_length_dwords;
@@ -1890,15 +1887,10 @@ int parse_platform_config(struct hfi1_devdata *dd)
 			/* metadata table */
 			switch (table_type) {
 			case PLATFORM_CONFIG_SYSTEM_TABLE:
-				/* fall through */
 			case PLATFORM_CONFIG_PORT_TABLE:
-				/* fall through */
 			case PLATFORM_CONFIG_RX_PRESET_TABLE:
-				/* fall through */
 			case PLATFORM_CONFIG_TX_PRESET_TABLE:
-				/* fall through */
 			case PLATFORM_CONFIG_QSFP_ATTEN_TABLE:
-				/* fall through */
 			case PLATFORM_CONFIG_VARIABLE_SETTINGS_TABLE:
 				break;
 			default:
@@ -2027,15 +2019,10 @@ static int get_platform_fw_field_metadata(struct hfi1_devdata *dd, int table,
 
 	switch (table) {
 	case PLATFORM_CONFIG_SYSTEM_TABLE:
-		/* fall through */
 	case PLATFORM_CONFIG_PORT_TABLE:
-		/* fall through */
 	case PLATFORM_CONFIG_RX_PRESET_TABLE:
-		/* fall through */
 	case PLATFORM_CONFIG_TX_PRESET_TABLE:
-		/* fall through */
 	case PLATFORM_CONFIG_QSFP_ATTEN_TABLE:
-		/* fall through */
 	case PLATFORM_CONFIG_VARIABLE_SETTINGS_TABLE:
 		if (field && field < platform_config_table_limits[table])
 			src_ptr =
@@ -2138,11 +2125,8 @@ int get_platform_config_field(struct hfi1_devdata *dd,
 			pcfgcache->config_tables[table_type].table;
 		break;
 	case PLATFORM_CONFIG_RX_PRESET_TABLE:
-		/* fall through */
 	case PLATFORM_CONFIG_TX_PRESET_TABLE:
-		/* fall through */
 	case PLATFORM_CONFIG_QSFP_ATTEN_TABLE:
-		/* fall through */
 	case PLATFORM_CONFIG_VARIABLE_SETTINGS_TABLE:
 		src_ptr = pcfgcache->config_tables[table_type].table;
 

drivers/infiniband/hw/hfi1/mad.c

@@ -721,7 +721,7 @@ static int check_mkey(struct hfi1_ibport *ibp, struct ib_mad_hdr *mad,
 			/* Bad mkey not a violation below level 2 */
 			if (ibp->rvp.mkeyprot < 2)
 				break;
-			/* fall through */
+			fallthrough;
 		case IB_MGMT_METHOD_SET:
 		case IB_MGMT_METHOD_TRAP_REPRESS:
 			if (ibp->rvp.mkey_violations != 0xFFFF)
@@ -1272,7 +1272,7 @@ static int set_port_states(struct hfi1_pportdata *ppd, struct opa_smp *smp,
 	case IB_PORT_NOP:
 		if (phys_state == IB_PORTPHYSSTATE_NOP)
 			break;
-		/* FALLTHROUGH */
+		fallthrough;
 	case IB_PORT_DOWN:
 		if (phys_state == IB_PORTPHYSSTATE_NOP) {
 			link_state = HLS_DN_DOWNDEF;
@@ -2300,7 +2300,6 @@ static int __subn_set_opa_vl_arb(struct opa_smp *smp, u32 am, u8 *data,
 	 * can be changed from the default values
 	 */
 	case OPA_VLARB_PREEMPT_ELEMENTS:
-		/* FALLTHROUGH */
 	case OPA_VLARB_PREEMPT_MATRIX:
 		smp->status |= IB_SMP_UNSUP_METH_ATTR;
 		break;
@@ -4170,7 +4169,7 @@ static int subn_get_opa_sma(__be16 attr_id, struct opa_smp *smp, u32 am,
 			return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 		if (ibp->rvp.port_cap_flags & IB_PORT_SM)
 			return IB_MAD_RESULT_SUCCESS;
-		/* FALLTHROUGH */
+		fallthrough;
 	default:
 		smp->status |= IB_SMP_UNSUP_METH_ATTR;
 		ret = reply((struct ib_mad_hdr *)smp);
@@ -4240,7 +4239,7 @@ static int subn_set_opa_sma(__be16 attr_id, struct opa_smp *smp, u32 am,
 			return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 		if (ibp->rvp.port_cap_flags & IB_PORT_SM)
 			return IB_MAD_RESULT_SUCCESS;
-		/* FALLTHROUGH */
+		fallthrough;
 	default:
 		smp->status |= IB_SMP_UNSUP_METH_ATTR;
 		ret = reply((struct ib_mad_hdr *)smp);

drivers/infiniband/hw/hfi1/pio.c

@@ -86,7 +86,7 @@ void pio_send_control(struct hfi1_devdata *dd, int op)
 	switch (op) {
 	case PSC_GLOBAL_ENABLE:
 		reg |= SEND_CTRL_SEND_ENABLE_SMASK;
-	/* Fall through */
+		fallthrough;
 	case PSC_DATA_VL_ENABLE:
 		mask = 0;
 		for (i = 0; i < ARRAY_SIZE(dd->vld); i++)

drivers/infiniband/hw/hfi1/pio_copy.c

@@ -191,22 +191,22 @@ static inline void jcopy(u8 *dest, const u8 *src, u32 n)
 	switch (n) {
 	case 7:
 		*dest++ = *src++;
-		/* fall through */
+		fallthrough;
 	case 6:
 		*dest++ = *src++;
-		/* fall through */
+		fallthrough;
 	case 5:
 		*dest++ = *src++;
-		/* fall through */
+		fallthrough;
 	case 4:
 		*dest++ = *src++;
-		/* fall through */
+		fallthrough;
 	case 3:
 		*dest++ = *src++;
-		/* fall through */
+		fallthrough;
 	case 2:
 		*dest++ = *src++;
-		/* fall through */
+		fallthrough;
 	case 1:
 		*dest++ = *src++;
 		/* fall through */

drivers/infiniband/hw/hfi1/platform.c

@@ -668,8 +668,8 @@ static u8 aoc_low_power_setting(struct hfi1_pportdata *ppd)
 
 	/* active optical cables only */
 	switch ((cache[QSFP_MOD_TECH_OFFS] & 0xF0) >> 4) {
-	case 0x0 ... 0x9: /* fallthrough */
-	case 0xC: /* fallthrough */
+	case 0x0 ... 0x9: fallthrough;
+	case 0xC: fallthrough;
 	case 0xE:
 		/* active AOC */
 		power_class = get_qsfp_power_class(cache[QSFP_MOD_PWR_OFFS]);
@@ -899,8 +899,8 @@ static int tune_qsfp(struct hfi1_pportdata *ppd,
 
 		*ptr_tuning_method = OPA_PASSIVE_TUNING;
 		break;
-	case 0x0 ... 0x9: /* fallthrough */
-	case 0xC: /* fallthrough */
+	case 0x0 ... 0x9: fallthrough;
+	case 0xC: fallthrough;
 	case 0xE:
 		ret = tune_active_qsfp(ppd, ptr_tx_preset, ptr_rx_preset,
 				       ptr_total_atten);
@@ -909,7 +909,7 @@ static int tune_qsfp(struct hfi1_pportdata *ppd,
 
 		*ptr_tuning_method = OPA_ACTIVE_TUNING;
 		break;
-	case 0xD: /* fallthrough */
+	case 0xD: fallthrough;
 	case 0xF:
 	default:
 		dd_dev_warn(ppd->dd, "%s: Unknown/unsupported cable\n",

drivers/infiniband/hw/hfi1/qp.c

@@ -312,7 +312,7 @@ int hfi1_setup_wqe(struct rvt_qp *qp, struct rvt_swqe *wqe, bool *call_send)
 	switch (qp->ibqp.qp_type) {
 	case IB_QPT_RC:
 		hfi1_setup_tid_rdma_wqe(qp, wqe);
-		/* fall through */
+		fallthrough;
 	case IB_QPT_UC:
 		if (wqe->length > 0x80000000U)
 			return -EINVAL;

drivers/infiniband/hw/hfi1/qsfp.c

@@ -231,7 +231,7 @@ static int i2c_bus_write(struct hfi1_devdata *dd, struct hfi1_i2c_bus *i2c,
 		break;
 	case 2:
 		offset_bytes[1] = (offset >> 8) & 0xff;
-		/* fall through */
+		fallthrough;
 	case 1:
 		num_msgs = 2;
 		offset_bytes[0] = offset & 0xff;
@@ -279,7 +279,7 @@ static int i2c_bus_read(struct hfi1_devdata *dd, struct hfi1_i2c_bus *bus,
 		break;
 	case 2:
 		offset_bytes[1] = (offset >> 8) & 0xff;
-		/* fall through */
+		fallthrough;
 	case 1:
 		num_msgs = 2;
 		offset_bytes[0] = offset & 0xff;

drivers/infiniband/hw/hfi1/rc.c

@@ -141,7 +141,7 @@ static int make_rc_ack(struct hfi1_ibdev *dev, struct rvt_qp *qp,
 	case OP(RDMA_READ_RESPONSE_ONLY):
 		e = &qp->s_ack_queue[qp->s_tail_ack_queue];
 		release_rdma_sge_mr(e);
-		/* FALLTHROUGH */
+		fallthrough;
 	case OP(ATOMIC_ACKNOWLEDGE):
 		/*
 		 * We can increment the tail pointer now that the last
@@ -160,7 +160,7 @@ static int make_rc_ack(struct hfi1_ibdev *dev, struct rvt_qp *qp,
 			qp->s_acked_ack_queue = next;
 		qp->s_tail_ack_queue = next;
 		trace_hfi1_rsp_make_rc_ack(qp, e->psn);
-		/* FALLTHROUGH */
+		fallthrough;
 	case OP(SEND_ONLY):
 	case OP(ACKNOWLEDGE):
 		/* Check for no next entry in the queue. */
@@ -267,7 +267,7 @@ static int make_rc_ack(struct hfi1_ibdev *dev, struct rvt_qp *qp,
 
 	case OP(RDMA_READ_RESPONSE_FIRST):
 		qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE);
-		/* FALLTHROUGH */
+		fallthrough;
 	case OP(RDMA_READ_RESPONSE_MIDDLE):
 		ps->s_txreq->ss = &qp->s_ack_rdma_sge;
 		ps->s_txreq->mr = qp->s_ack_rdma_sge.sge.mr;
@@ -881,8 +881,7 @@ int hfi1_make_rc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
 				goto bail;
 			}
 			qp->s_num_rd_atomic++;
-
-			/* FALLTHROUGH */
+			fallthrough;
 		case IB_WR_OPFN:
 			if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
 				qp->s_lsn++;
@@ -946,10 +945,10 @@ int hfi1_make_rc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
 		 * See restart_rc().
 		 */
 		qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu);
-		/* FALLTHROUGH */
+		fallthrough;
 	case OP(SEND_FIRST):
 		qp->s_state = OP(SEND_MIDDLE);
-		/* FALLTHROUGH */
+		fallthrough;
 	case OP(SEND_MIDDLE):
 		bth2 = mask_psn(qp->s_psn++);
 		ss = &qp->s_sge;
@@ -991,10 +990,10 @@ int hfi1_make_rc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
 		 * See restart_rc().
 		 */
 		qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu);
-		/* FALLTHROUGH */
+		fallthrough;
 	case OP(RDMA_WRITE_FIRST):
 		qp->s_state = OP(RDMA_WRITE_MIDDLE);
-		/* FALLTHROUGH */
+		fallthrough;
 	case OP(RDMA_WRITE_MIDDLE):
 		bth2 = mask_psn(qp->s_psn++);
 		ss = &qp->s_sge;
@@ -2901,7 +2900,7 @@ void hfi1_rc_rcv(struct hfi1_packet *packet)
 		if (!ret)
 			goto rnr_nak;
 		qp->r_rcv_len = 0;
-		/* FALLTHROUGH */
+		fallthrough;
 	case OP(SEND_MIDDLE):
 	case OP(RDMA_WRITE_MIDDLE):
 send_middle:
@@ -2941,7 +2940,7 @@ void hfi1_rc_rcv(struct hfi1_packet *packet)
 			goto no_immediate_data;
 		if (opcode == OP(SEND_ONLY_WITH_INVALIDATE))
 			goto send_last_inv;
-		/* FALLTHROUGH -- for SEND_ONLY_WITH_IMMEDIATE */
+		fallthrough;	/* for SEND_ONLY_WITH_IMMEDIATE */
 	case OP(SEND_LAST_WITH_IMMEDIATE):
 send_last_imm:
 		wc.ex.imm_data = ohdr->u.imm_data;
@@ -2957,7 +2956,7 @@ void hfi1_rc_rcv(struct hfi1_packet *packet)
 		goto send_last;
 	case OP(RDMA_WRITE_LAST):
 		copy_last = rvt_is_user_qp(qp);
-		/* fall through */
+		fallthrough;
 	case OP(SEND_LAST):
 no_immediate_data:
 		wc.wc_flags = 0;
@@ -3010,7 +3009,7 @@ void hfi1_rc_rcv(struct hfi1_packet *packet)
 
 	case OP(RDMA_WRITE_ONLY):
 		copy_last = rvt_is_user_qp(qp);
-		/* fall through */
+		fallthrough;
 	case OP(RDMA_WRITE_FIRST):
 	case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
 		if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE)))

drivers/infiniband/hw/hfi1/sdma.c

@@ -2584,7 +2584,7 @@ static void __sdma_process_event(struct sdma_engine *sde,
 			 * 7220, e.g.
 			 */
 			ss->go_s99_running = 1;
-			/* fall through -- and start dma engine */
+			fallthrough;	/* and start dma engine */
 		case sdma_event_e10_go_hw_start:
 			/* This reference means the state machine is started */
 			sdma_get(&sde->state);
@@ -2726,7 +2726,6 @@ static void __sdma_process_event(struct sdma_engine *sde,
 		case sdma_event_e70_go_idle:
 			break;
 		case sdma_event_e85_link_down:
-			/* fall through */
 		case sdma_event_e80_hw_freeze:
 			sdma_set_state(sde, sdma_state_s80_hw_freeze);
 			atomic_dec(&sde->dd->sdma_unfreeze_count);
@@ -3007,7 +3006,7 @@ static void __sdma_process_event(struct sdma_engine *sde,
 		case sdma_event_e60_hw_halted:
 			need_progress = 1;
 			sdma_err_progress_check_schedule(sde);
-			/* fall through */
+			fallthrough;
 		case sdma_event_e90_sw_halted:
 			/*
 			* SW initiated halt does not perform engines
@@ -3021,7 +3020,7 @@ static void __sdma_process_event(struct sdma_engine *sde,
 			break;
 		case sdma_event_e85_link_down:
 			ss->go_s99_running = 0;
-			/* fall through */
+			fallthrough;
 		case sdma_event_e80_hw_freeze:
 			sdma_set_state(sde, sdma_state_s80_hw_freeze);
 			atomic_dec(&sde->dd->sdma_unfreeze_count);
@@ -3252,7 +3251,7 @@ void _sdma_txreq_ahgadd(
 		tx->num_desc++;
 		tx->descs[2].qw[0] = 0;
 		tx->descs[2].qw[1] = 0;
-		/* FALLTHROUGH */
+		fallthrough;
 	case SDMA_AHG_APPLY_UPDATE2:
 		tx->num_desc++;
 		tx->descs[1].qw[0] = 0;

drivers/infiniband/hw/hfi1/tid_rdma.c

@@ -3227,7 +3227,7 @@ bool hfi1_tid_rdma_wqe_interlock(struct rvt_qp *qp, struct rvt_swqe *wqe)
 	case IB_WR_RDMA_READ:
 		if (prev->wr.opcode != IB_WR_TID_RDMA_WRITE)
 			break;
-		/* fall through */
+		fallthrough;
 	case IB_WR_TID_RDMA_READ:
 		switch (prev->wr.opcode) {
 		case IB_WR_RDMA_READ:
@@ -5067,7 +5067,7 @@ int hfi1_make_tid_rdma_pkt(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
 		if (priv->s_state == TID_OP(WRITE_REQ))
 			hfi1_tid_rdma_restart_req(qp, wqe, &bth2);
 		priv->s_state = TID_OP(WRITE_DATA);
-		/* fall through */
+		fallthrough;
 
 	case TID_OP(WRITE_DATA):
 		/*

drivers/infiniband/hw/hfi1/uc.c

@@ -216,7 +216,7 @@ int hfi1_make_uc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
 
 	case OP(SEND_FIRST):
 		qp->s_state = OP(SEND_MIDDLE);
-		/* FALLTHROUGH */
+		fallthrough;
 	case OP(SEND_MIDDLE):
 		len = qp->s_len;
 		if (len > pmtu) {
@@ -241,7 +241,7 @@ int hfi1_make_uc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
 
 	case OP(RDMA_WRITE_FIRST):
 		qp->s_state = OP(RDMA_WRITE_MIDDLE);
-		/* FALLTHROUGH */
+		fallthrough;
 	case OP(RDMA_WRITE_MIDDLE):
 		len = qp->s_len;
 		if (len > pmtu) {
@@ -414,7 +414,7 @@ void hfi1_uc_rcv(struct hfi1_packet *packet)
 			goto no_immediate_data;
 		else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
 			goto send_last_imm;
-		/* FALLTHROUGH */
+		fallthrough;
 	case OP(SEND_MIDDLE):
 		/* Check for invalid length PMTU or posted rwqe len. */
 		/*
@@ -515,7 +515,7 @@ void hfi1_uc_rcv(struct hfi1_packet *packet)
 			wc.ex.imm_data = ohdr->u.rc.imm_data;
 			goto rdma_last_imm;
 		}
-		/* FALLTHROUGH */
+		fallthrough;
 	case OP(RDMA_WRITE_MIDDLE):
 		/* Check for invalid length PMTU or posted rwqe len. */
 		if (unlikely(tlen != (hdrsize + pmtu + 4)))